hmmm... Weight Transfer AU Cas getting drunk/high one night to relieve the stress, forgetting in a haze about his partners' weight predicament, ordering WAY too much food to satisfy the munchies, stuffing himself all night long...
One hangover later and suddenly Oli and Rach are sporting one or two more chins than usual, Cas forgetting aaaaalll about the night before... Poor guy, whatever could have happened?